Diesel engine



H. RoHwER 1,721,040

DIESEL ENGINE July 16, 1929.

Filed Nov. 15, 1927 Patented July 16,1929. y

UNITED STATES HEINRICH ROHWER, OF KIEL, GERMANY,

ASSIGNR T0 FRIED. KRUIPP GERMANIA- WERFT AKTIENGESELLSCHAFT, OF KIEL-GAARDEN, GEIBMAITY.

DIESEL ENGINE.

Application' led November 15, 1927, Serial No. 283,510, and in Germany November 22, 1926.

' differential piston serves both pumps, and by providing a throw-over member, by means of which, the braking air pump vmay be connected selectively to the compressed air receiver for the starting and braking air or to the supplemental charging air piping.

The invention is illustrated in the accompanying drawing by way of example.

A denqtes a six cylinder Diesel engine operating without a compressor, to which is attached a combined charging and braking air pump B actuated from the crank shaft of the machine. The piston C of the air pump B is constructed as a dilerential plunger and forms with the housing of pumpv 'B three' working chambers b1, b2 and b3. The chambersb1 belong to the charging pump, while the chamber b3 forms-the working space of the starting and braking air pump. In the cover of the pump housing are provided the suction valve D and the pressure valve E for the pump chamber b3. The suction valves F and the pressure valves G or the pump chambers b1 and b2 are arranged in lateral pockets of the housing of pump B. The pressure valves G open'into-a common pressure chamber b4, to which is connected the pipe H for the supplemental charging air. Pi e H leads to the 'supplemental charging` mem ers (not shown) of the individual cylinders' of the engine. The ressure valve E of the pump chamber b for t e starting and braking air opens into a pipe J, to whlch is connected the receiver K for the starting and braking air. A cheek valve L opening toward the receiver K is arranged in the pipe J. A pipe M branches off :from plipe J before this check valve and opens into t e supplemental charging air pipe H. In the pipe M there is arranged a throwover member N, by meansof which the braking air vpump may be connected selectively to said last-named air, and a check valve arthe compressed air receiver for the starting and braking air or to the supplemental chargmg air pipe. f

In the open position, as shown in the drawing, of the throw-over member N, all

said pump chambers b1, b2, b3 deliver into the supplemental charging air pipe H. The enntire air supplied is thus employed as supplemental charging air to increase the capacity 'of the engine A. As the pressure of the sup- 65 plemental charging air is considerably lower than the normal pressureoflthe starting air in the receiver K, the check valve L remains closed. llhen, however, the pressure in the receiver K has been lowered so far, due to starting or braking operations, that the receiver K has to be re-ille'd, the throw-over member` N is closed. The air delivered into the chamber Zr is now supplied, through the pressure valve E, check valve L and pipe J,

to the compressed air receiver K. When the receiver K has been re-fllled suiiciently, the throw-over member N isy opened anew, and the air delivered into the chamber b3 is again used as supplemental charging air.

What I claim and desire to secure by Letters Patent, is .f

1. In a Diesel enginea starting and braking air pump and a supplemental' charging air pump, sald two pumps having a common differential iston' adapted to produce starting and bra ing air by one of its surfaces and supplemental charging air by its other surface, and means for enabling said firstnamed air to be temporarily added to said last-named air.

2. In a Diesel engine a starting and braking vair pump and a supplemental charging air pump,`sa1d two pumps having a common differential piston having two surfaces and adapted to produce start-ing and braking air by its smaller surface and supplemental charging air by its larger surface, and means for enabling said first-named air to be temporarily added to said last-named air.

3. In a Diesel engine a starting and braking air pump and a supplemental charging. air pump, said two pumps having a common diierential piston adapted to produce starting and brakin air by one of its surfaces and supplemental ciarging air by its other surface, a receiver for said first-named air connected to said pump, means for enablinc` said lirst-named air to be temporarily adced to ranged between said pump and said receiver for said first-named air connected to said 10 and opening toward t-he latter. Q 4. In a Diesel engine a starting and brakl ing air pump and a supplemental charging air pump, said two pumps having a common differential piston having two surfaces and adapted to produce startlng and braking air b its smaller surface and supplemental cliarging air by its larger surface, a receiver pump, Ameans for enabling said first-named air to be temporarily added yto said lastnamed air, and a.' check valve arranged between said pump and said receiver and opening toward the later.

The foregoing specification signed at Hamburg, this 26th ay of October, 1927.

HEINRICH ROHWER. 

